Java tutorial
/** * openHAB, the open Home Automation Bus. * Copyright (C) 2010-2013, openHAB.org <admin@openhab.org> * * See the contributors.txt file in the distribution for a * full listing of individual contributors. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses>. * * Additional permission under GNU GPL version 3 section 7 * * If you modify this Program, or any covered work, by linking or * combining it with Eclipse (or a modified version of that library), * containing parts covered by the terms of the Eclipse Public License * (EPL), the licensors of this Program grant you additional permission * to convey the resulting work. */ package org.openhab.io.net.internal.jabber; import java.util.Dictionary; import org.apache.commons.lang.StringUtils; import org.jivesoftware.smack.ConnectionConfiguration; import org.jivesoftware.smack.ConnectionListener; import org.jivesoftware.smack.XMPPConnection; import org.jivesoftware.smack.XMPPException; import org.osgi.service.cm.ConfigurationException; import org.osgi.service.cm.ManagedService; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * This class provides XMPP access. An account can be configured, which is then * used for sending and receiving messages. * * @author Kai Kreuzer * @since 0.4.0 */ public class XMPPConnect implements ManagedService { static private final Logger logger = LoggerFactory.getLogger(XMPPConnect.class); private static String servername; private static String proxy; private static Integer port; private static String username; private static String password; private static String[] consoleUsers; private static boolean initialized = false; private static XMPPConnection connection; @SuppressWarnings("rawtypes") public void updated(Dictionary config) throws ConfigurationException { if (config != null) { XMPPConnect.servername = (String) config.get("servername"); XMPPConnect.proxy = (String) config.get("proxy"); String portString = (String) config.get("port"); if (portString != null) { XMPPConnect.port = Integer.valueOf(portString); } XMPPConnect.username = (String) config.get("username"); XMPPConnect.password = (String) config.get("password"); String users = (String) config.get("consoleusers"); if (!StringUtils.isEmpty(users)) { XMPPConnect.consoleUsers = users.split(","); } // check mandatory settings if (servername == null || servername.isEmpty()) return; if (username == null || username.isEmpty()) return; if (password == null || password.isEmpty()) return; // set defaults for optional settings if (port == null) { port = 5222; } establishConnection(); } } private static void establishConnection() { if (servername != null) { ConnectionConfiguration config; // Create a connection to the jabber server on the given port if (proxy != null) { config = new ConnectionConfiguration(servername, port, proxy); } else { config = new ConnectionConfiguration(servername, port); } if (connection != null && connection.isConnected()) { connection.disconnect(); } connection = new XMPPConnection(config); try { connection.connect(); connection.login(username, password); if (consoleUsers.length > 0) { connection.getChatManager().addChatListener(new XMPPConsole(consoleUsers)); connection.addConnectionListener(new XMPPConnectionListener()); } logger.info("Connection to XMPP as '{}' has been established.", username); initialized = true; } catch (XMPPException e) { logger.error("Could not establish connection to XMPP server '" + servername + ":" + port + "': {}", e.getMessage()); } catch (NullPointerException e) { logger.error("Could not establish connection to XMPP server '" + servername + ":" + port + "'"); } } } /** * returns the active connection which can be used to send messages * * @return the XMPP connection * @throws NotInitializedException * if the connection has not been established successfully */ public static XMPPConnection getConnection() throws NotInitializedException { if (!initialized) { establishConnection(); if (!initialized) { throw new NotInitializedException(); } } return connection; } private static class XMPPConnectionListener implements ConnectionListener { public void connectionClosed() { logger.debug("XMPP connection has been closed."); initialized = false; } public void connectionClosedOnError(Exception e) { logger.info("XMPP connection has been closed on error: {}", e.getMessage()); try { if (!connection.isConnected()) { initialized = false; getConnection(); } logger.info("XMPP re-connection succeeded."); } catch (NotInitializedException nie) { logger.error("XMPP re-connection failed, giving up: {}", nie.getMessage()); } } public void reconnectingIn(int s) { } public void reconnectionFailed(Exception e) { logger.debug("XMPP re-connection failed.", e); } public void reconnectionSuccessful() { try { if (!connection.isConnected()) { initialized = false; getConnection(); } logger.debug("XMPP re-connection succeeded."); } catch (NotInitializedException e) { logger.debug("XMPP re-connection failed, giving up."); } } } }